From 93ddfb2a106fa7a18e978f36786b87ffe7394e10 Mon Sep 17 00:00:00 2001
From: xescugc <xescugil@gmail.com>
Date: Thu, 18 Dec 2025 00:17:33 +0100
Subject: [PATCH] ebitest: Fixed image detector, output and 'GetAll'

Also improved the output (image) by selecting what was found if the expectation
was to not find it
---
 Makefile             |   4 +-
 README.md            |  42 ++++++++++----
 docs/error_image.png | Bin 6555 -> 0 bytes
 docs/should.png      | Bin 0 -> 8104 bytes
 docs/should_not.png  | Bin 0 -> 7989 bytes
 ebitest.go           | 132 +++++++++++++++++++++++--------------------
 ebitest_test.go      |   9 ++-
 utils.go             |   2 +-
 8 files changed, 112 insertions(+), 77 deletions(-)
 delete mode 100644 docs/error_image.png
 create mode 100644 docs/should.png
 create mode 100644 docs/should_not.png

diff --git a/Makefile b/Makefile
index 9b52d01..f9e2116 100644
--- a/Makefile
+++ b/Makefile
@@ -3,8 +3,8 @@ help: ## Show this help
 	@grep -F -h "##" $(MAKEFILE_LIST) | grep -F -v grep -F | sed -e 's/:.*##/:##/' | column -t -s '##'
 
 .PHONY: test
-test: ## Runs the test
-	@xvfb-run go test ./... $(ARGS)
+test:
+	@xvfb-run go test ./...
 
 .PHONY: pprof
 pprof: ## Runs pprof server for 'cpu.out'
diff --git a/README.md b/README.md
index 01a3699..2483223 100644
--- a/README.md
+++ b/README.md
@@ -91,28 +91,43 @@ func TestGameUI(t *testing.T) {
 }
 ```
 
-The output of this test (that fails) is the following:
+An output could be for example
 
 ```
---- FAIL: TestGameUI (7.52s)
-    ebitest_test.go:28: 
-                Error Trace:    /home/xescugc/repos/ebitest/ebitest.go:113
-                                                        /home/xescugc/repos/ebitest/ebitest_test.go:28
+--- FAIL: TestGameButton (9.34s)
+    ebitest_test.go:39: 
+                Error Trace:    ebitest.go:150
+                                                        ebitest_test.go:39
+                Error:          selector found
+                                image at: ebitest/_ebitest_dump/019b2e81-8d9a-7bb7-ba16-639756d11e58.png
+                Test:           TestGameButton
+    ebitest_test.go:43: 
+                Error Trace:    ebitest.go:126
+                                                        ebitest_test.go:43
                 Error:          selector not found
-                                image at: _ebitest_dump/019b1537-1c60-7041-ad54-0297ea4b0eef.png
-                Test:           TestGameUI
+                                image at: ebitest/_ebitest_dump/019b2e81-966e-7715-8c5f-6a6acc92720c.png
+                Test:           TestGameButton
 FAIL
-FAIL    github.com/xescugc/ebitest      7.578s
+FAIL    github.com/xescugc/ebitest      9.393s
 FAIL
-make: *** [Makefile:7: test] Error 1
+make: *** [Makefile:7: test] Error 
 ```
 
-And if you open the `_ebitest_dump/019b1537-1c60-7041-ad54-0297ea4b0eef.png` (on the current path) you see
+And then you have the `image at: ebitest/_ebitest_dump/019b2e81-8d9a-7bb7-ba16-639756d11e58.png` that expects to not find something, and it finds
+it and reports the image with the highlight of what was found. At the top right you can see what was looking for.
 
 <p align="center">
-    <img src="docs/error_image.png" width=50% height=50%>
+    <img src="docs/should_not.png" width=50% height=50%>
 </p>
 
+And the `image at: ebitest/_ebitest_dump/019b2e81-966e-7715-8c5f-6a6acc92720c.png` that expect to find something that was not found. At the top right
+you can see what was looking for.
+
+<p align="center">
+    <img src="docs/should.png" width=50% height=50%>
+</p>
+
+
 ## Run it on a CI
 
 If the CI has low resources (like GitHub Actions) it'll most likely fail (check `Known issues#2`) but you
@@ -133,6 +148,11 @@ so an expectation may randomly fail.
 
 I kind of fixed it (100 consecutive test pass) using a custom [PingPong](./ping_pong.go) and [TicTacToe](./tic_tac_toe.go) that basically forces a context switch and synchronizes Input+Game.Update+Game.Draw but it still fails in low resource like GitHub [Actions](https://github.com/xescugc/ebitest/actions) for example.
 
+3/ Size of the screen
+
+By default the screen is of `640x480` if using `xvfb`. To make it bigger you can directly increase the size with `ebiten.SetWindowSize(750, 750)`, though setting big sizes
+I've seen it causes some issues that the click are not where they are expected to be and are a bit off and miss which causes errors.
+
 ## Plans
 
 * Add more helpers for assertions (like animations)
diff --git a/docs/error_image.png b/docs/error_image.png
deleted file mode 100644
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GIT binary patch
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HcmV?d00001

diff --git a/ebitest.go b/ebitest.go
index ee58304..e0248aa 100644
--- a/ebitest.go
+++ b/ebitest.go
@@ -24,6 +24,10 @@ const (
 	findAllSelectors = true
 )
 
+var (
+	emptyRec image.Rectangle
+)
+
 type Ebitest struct {
 	game     *Game
 	PingPong *PingPong
@@ -116,7 +120,7 @@ func (e *Ebitest) Should(t *testing.T, s interface{}) (*Selector, bool) {
 	if !ok {
 		msg := "selector not found"
 		if e.options.dumpErrorImages {
-			p := dumpErrorImages(sc, sel.Image())
+			p := dumpErrorImages(sc, sel)
 			msg += "\nimage at: " + p
 		}
 		assert.Fail(t, msg)
@@ -140,7 +144,7 @@ func (e *Ebitest) ShouldNot(t *testing.T, s interface{}) bool {
 
 	msg := "selector found"
 	if e.options.dumpErrorImages {
-		p := dumpErrorImages(sc, sel.Image())
+		p := dumpErrorImages(sc, sel)
 		msg += "\nimage at: " + p
 	}
 	assert.Fail(t, msg)
@@ -159,7 +163,7 @@ func (e *Ebitest) Must(t *testing.T, s interface{}) *Selector {
 	if !ok {
 		msg := "selector not found"
 		if e.options.dumpErrorImages {
-			p := dumpErrorImages(sc, sel.Image())
+			p := dumpErrorImages(sc, sel)
 			msg += "\nimage at: " + p
 		}
 		require.Fail(t, msg)
@@ -184,7 +188,7 @@ func (e *Ebitest) MustNot(t *testing.T, s interface{}) {
 
 	msg := "selector found"
 	if e.options.dumpErrorImages {
-		p := dumpErrorImages(sc, sel.Image())
+		p := dumpErrorImages(sc, sel)
 		msg += "\nimage at: " + p
 	}
 	require.Fail(t, msg)
@@ -193,7 +197,9 @@ func (e *Ebitest) MustNot(t *testing.T, s interface{}) {
 // GetAll returns all the repeated instances of s or none if nothing is found
 func (e *Ebitest) GetAll(s interface{}) []*Selector {
 	sc := e.game.GetScreen()
-	return e.findSelectors(sc, s, findAllSelectors)
+	sels, _ := e.findSelectors(sc, s, findAllSelectors)
+
+	return sels
 }
 
 // KeyTap taps all the keys at once
@@ -222,15 +228,15 @@ func (e *Ebitest) getSelector(s interface{}) *Selector {
 
 // findSelector returns a Selector from ss if found. `all` will basically mean it'll return all of them
 func (e *Ebitest) findSelector(sc image.Image, ss interface{}) (*Selector, bool) {
-	sels := e.findSelectors(sc, ss, !findAllSelectors)
+	sels, sel := e.findSelectors(sc, ss, !findAllSelectors)
 	if len(sels) == 0 {
-		return nil, false
+		return sel, false
 	}
 	return sels[0], true
 }
 
 // findSelector returns a Selector from ss if found. `all` will basically mean it'll return all of them
-func (e *Ebitest) findSelectors(sc image.Image, ss interface{}, all bool) []*Selector {
+func (e *Ebitest) findSelectors(sc image.Image, ss interface{}, all bool) ([]*Selector, *Selector) {
 	selectors := make([]*Selector, 0)
 	bsel := e.getSelector(ss)
 
@@ -247,18 +253,50 @@ func (e *Ebitest) findSelectors(sc image.Image, ss interface{}, all bool) []*Sel
 				sel.PingPong = e.PingPong
 				selectors = append(selectors, sel)
 				if !all {
-					return selectors
+					return selectors, bsel
 				}
 			}
 		}
 	}
 
-	return selectors
+	return selectors, bsel
+}
+
+// hasImageAt checks if the image sub is image i at the ix, iy
+func hasImageAt(i, sub image.Image, ix, iy int) bool {
+	sx, sy := sub.Bounds().Dx(), sub.Bounds().Dy()
+	for x := range sx {
+		for y := range sy {
+			sc := sub.At(x, y)
+			ic := i.At(ix+x, iy+y)
+
+			nsc := sc.(color.NRGBA)
+			// If the source it's transparent we ignore it
+			// we want to only compare colors so we consider
+			// it as good
+			if nsc.A != 255 {
+				continue
+			}
+
+			if !equalColors(sc, ic) {
+				return false
+			}
+		}
+	}
+	return true
+}
+
+// equalColors checks if c1 and c2 have the same RGB
+func equalColors(c1, c2 color.Color) bool {
+	r1, g1, b1, _ := c1.RGBA()
+	r2, g2, b2, _ := c2.RGBA()
+	return r1 == r2 && g1 == g2 && b1 == b2
 }
 
 // dumpErrorImages dumps a composition of the 2 images into 1 so it displays
 // what was checked
-func dumpErrorImages(s, i image.Image) string {
+func dumpErrorImages(s image.Image, sel *Selector) string {
+	i := sel.Image()
 	sb := s.Bounds()
 	ib := i.Bounds()
 	x := sb.Dx() + ib.Dx()
@@ -268,6 +306,10 @@ func dumpErrorImages(s, i image.Image) string {
 	draw.Draw(img, sb, s, image.Point{}, draw.Over)
 	draw.Draw(img, image.Rect(sb.Dx(), 0, x, ib.Dy()), i, image.Point{}, draw.Over)
 
+	if sel.Rec() != emptyRec {
+		drawRectangle(img, sel.Rec(), 2)
+	}
+
 	u, _ := uuid.NewV7()
 
 	ip := filepath.Join(baseDumpFoler, u.String()+".png")
@@ -277,6 +319,24 @@ func dumpErrorImages(s, i image.Image) string {
 	return filepath.Join(wd, ip)
 }
 
+// drawRectangle will draw in the image(img) the rectangel(rec) with thiknes
+func drawRectangle(img *image.RGBA, rec image.Rectangle, thickness int) {
+	col := color.RGBA{255, 0, 0, 255}
+
+	for t := 0; t < thickness; t++ {
+		// draw horizontal lines
+		for x := rec.Min.X; x <= rec.Max.X; x++ {
+			img.Set(x, rec.Min.Y+t, col)
+			img.Set(x, rec.Max.Y-t, col)
+		}
+		// draw vertical lines
+		for y := rec.Min.Y; y <= rec.Max.Y; y++ {
+			img.Set(rec.Min.X+t, y, col)
+			img.Set(rec.Max.X-t, y, col)
+		}
+	}
+}
+
 // writeImage writes on the path the image i
 func writeImage(path string, i image.Image) {
 	f, err := os.Create(path)
@@ -289,53 +349,3 @@ func writeImage(path string, i image.Image) {
 		log.Fatal(err)
 	}
 }
-
-// hasImageAt checks if the image sub is image i at the ix, iy
-func hasImageAt(i, sub image.Image, ix, iy int) bool {
-	sx, sy := sub.Bounds().Dx(), sub.Bounds().Dy()
-	for x := range sx {
-		for y := range sy {
-			ic := toNRGBA(i.At(ix+x, iy+y))
-			sc := toNRGBA(sub.At(x, y))
-			sr, sg, sb, sa := sc.RGBA()
-
-			// If the source it's transparent we ignore it
-			// we want to only compare colors so we consider
-			// it as good
-			if sa == 0 || (sr == 0 && sg == 0 && sb == 0) {
-				continue
-			}
-
-			if !equalColors(sc, ic) {
-				return false
-			}
-		}
-	}
-	return true
-}
-
-// equalColors checks if c1 and c2 have the same RGB
-func equalColors(c1, c2 color.Color) bool {
-	r1, g1, b1, _ := c1.RGBA()
-	r2, g2, b2, _ := c2.RGBA()
-	return r1 == r2 && g1 == g2 && b1 == b2
-}
-
-// toNRGBA convers a pre-multiplied alpha color to a non pre-multiplied alpha one
-func toNRGBA(c color.Color) color.Color {
-	r, g, b, a := c.RGBA()
-	if a == 0 {
-		return color.NRGBA{0, 0, 0, 0}
-	}
-
-	// Since color.Color is alpha pre-multiplied, we need to divide the
-	// RGB values by alpha again in order to get back the original RGB.
-	r *= 0xffff
-	r /= a
-	g *= 0xffff
-	g /= a
-	b *= 0xffff
-	b /= a
-
-	return color.NRGBA{uint8(r / 65535), uint8(g / 65535), uint8(b / 65535), 255}
-}
diff --git a/ebitest_test.go b/ebitest_test.go
index bff47a4..e55bda3 100644
--- a/ebitest_test.go
+++ b/ebitest_test.go
@@ -32,10 +32,16 @@ func TestGameButton(t *testing.T) {
 	text1_2 := "Click Me 2"
 	text2 := "Clicked Me"
 
-	t1s, _ := et.Should(t, text1)
+	t1s := et.Must(t, text1)
 	t1_2s, _ := et.Should(t, text1_2)
+
+	// Fails
+	et.ShouldNot(t, text1_2)
 	et.ShouldNot(t, text2)
 
+	// Fails
+	et.Should(t, text2)
+
 	t1s.Click()
 
 	et.Should(t, text1_2)
@@ -47,7 +53,6 @@ func TestGameButton(t *testing.T) {
 	et.ShouldNot(t, text1_2)
 	assert.Len(t, et.GetAll(text2), 2)
 
-	//et.KeyTap(ebiten.KeyShift, ebiten.KeyI)
 	et.KeyTap(ebiten.KeyI, ebiten.KeyShift)
 	assert.True(t, g.ClickedShiftI)
 }
diff --git a/utils.go b/utils.go
index 2aa24eb..00e099a 100644
--- a/utils.go
+++ b/utils.go
@@ -9,7 +9,7 @@ import (
 // ebitenImageToImage converts an ebiten.Image to an image.Image
 func ebitenImageToImage(ei *ebiten.Image) image.Image {
 	b := ei.Bounds()
-	img := image.NewGray(image.Rect(0, 0, b.Dx(), b.Dy()))
+	img := image.NewNRGBA(image.Rect(0, 0, b.Dx(), b.Dy()))
 
 	ix, iy := ei.Bounds().Dx(), ei.Bounds().Dy()
 	for x := range ix {